Question | Answer |
Contractility | Ability of skeletal muscle to shorten with force. |
Excitability | Caoacityof skeletal muscle to respond to a stimulus. |
Four Characteristics of skeletal muscles | Contractility,excitability,extensibility, elasicity |
Connective tissue located outside the epimysium? | Fascia |
connective tissue sheath surrounding the skeletal muscle? | epimysium |
fasciculi are composed of? | single muscle cells called fibers |
muscle fasciculi are surrounded by? | lose connective tissue called perimysium |
what occurs in the absence of oxygen? | anerobic respiration |
muscle fibers that fatigue quickly | fast twitch |
muscle fibers that are resistant to fatigue | slow twitch |
what raises the eyebrows | capiton frontalis |
two types of tongue muscles | interior, exterior |
what closes the eyelids | orbicularis occuli |
what is actin myofilaments | thin myofilaments |
myosin myofilaments | thick myofilaments |
what is sarcomeres | basic structural and functional unity of the muscle. |
Erector spinae | group of muscles on each side of the back. |
what is the erector spinae responsible for | for keeping the back straight and the body erect |
Thoracic Muscles | muscles that move the thorax |
Leg Movements | Quadriceps femoris & Sartorius |
Sartorius | “tailors muscle”; flexes the thigh |
Quadriceps femoris | extends the leg; anterior thigh muscles |
Hamstring muscles | flexes the leg and extends the thigh |
Gastrocnemius and soleus form what | calf muscles |
Flexor carpi | flexes the wrist |
Extensor carpi | extends the wrist |
Flexor digitorum | flexes the fingers |
Extensor digitorum | extends the fingers |
Triceps brachii | extends the forearm. Occupies the posterior compartment of the arm |
BEGINING OF A CONTRACTION | lag phase |
time of contraction | contraction phase |
time when muscle relaxes | relaxation phase |
tetany | muscle remains contracted without relaxing |
where is ATP produced | mitochondria |
when ATP is used faster than it is produced | muscle fatigue |
anaerobic respiration | without oxygen |
aerobic respiration | with oxygen |
muscle fatigue | when ATP is being used faster than it is produced |
isometric | length stays the same tention increases |
isotonic | amont of tention is constantduring contraction |
muscle tone | constant tention produced by musles of the body for long periods of time |
origin | most stationary end of the muscle |
insertion | end of the muscle undergoing greatest movemnt |
part of muscle between the origin and the insertion is called? | belly |
each sarcomere extends from what? | Z line |
enlarged nerve terminal | presynaptic terminal |
muscles that work together to acomplish speccificmovements are called | synergists |
muscles that work in opposition of eachother are called | antagonists |
Trapezius | rotates scalpula |
serratus anterior | pulls scapula anteriorly |
arm is attached to the? | thorax |
pectoralis major | adducts and flexes arm |
"swimmer muscles" | latissimus dorsi |
deltoid | attaches the humerous to the scalpula and clavical |
gluteus maximus | buttocks |
gluteus medius | hip muscle |
common injection site | gludeus medius |
quadriceps femoris | extends the leg |
sartorius | flexes thigh |
extends thigh | hamstring |
gastronemius and soleus | form the calf muscle |
lateral muscle of the leg | peronous |
20 muscles located in the foot | intrinsic foot |
prime mover | one who plays a major role in accomplishing the desired movement |
two major kind of protin fibers | actin and myosin |
resting membrane potential | charge difference across membranes |
action potential | the breif reversal back of charge |
synaptic vesicles | secrete a neurotransmitter |
acetylcholine | neurotransmitter |
synaptic cleft | muscle cell |
motor unit | form single muscle |
motor neurons | nerve cells that carry actin potentials |
all or none response | reaches threshold or doesnt |
broken down by enzymes | acetylcholinesterase |
A band extends the length of ? | myosin |